Hi all, I'm going to be fitting a new shower. I've read plenty of advice on kerdi vs liquid membrane etc etc, but one question I don't see being asked is how much of the wall should you do - lets say my bathroom is 3m by 3m and I'm putting in a 900mm Quadrant. How much of the two walls that touch would you waterproof - just the bit behind the shower and a "bit more" ? If so, can't the water go "around" the matting/membrane then?

Now I'm confused. I was under the impression I waterproof - walls and floor - then fit tray on it, tile down to the tray.

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No. It should be tray in first then then the tape in the kit laps down on top, then the membrane goes over the tape, bridging the gap between the wall and the tray, preventing anything getting in between.

Agree x 2

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If it moves, shoot it. If it doesn't move, shoot it until it moves........ then shoot it again!

I disagree that's the best way to tank a shower enclosure is to fit the tray and tank down to it. Surely the best way is to fully tank the wall to the floor, then fit the tray, silicone it well with a profile tool, then tile.

Imo the perfect way would be fully tank the wall to floor, obviously tape the corner, fit the tray and silicone, then apply butyl tape over lapping on to tray which will stick like you know what to the tray

Imo the perfect way would be fully tank the wall to floor, obviously tape the corner, fit the tray and silicone, then apply butyl tape over lapping on to tray which will stick like you know what to the tray

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Ok, see your point. So you are still taping down to the shower but painting the membrane beneath as well. Suppose it seems silly not to for the amount of membrane it will use, if for any reason the the tape/silicone fails. Point taken onboard

If it moves, shoot it. If it doesn't move, shoot it until it moves........ then shoot it again!

I like trays fitted using classi seal too (unless the plumber stretches the corner). Then silicone that to the wall and tanking tape over all internals, joins and the classi seal/tray. Then paste everywhere in the shower to the ceiling.

No. It should be tray in first then then the tape in the kit laps down on top, then the membrane goes over the tape, bridging the gap between the wall and the tray, preventing anything getting in between.